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90+x+(x-20)=180
We move all terms to the left:
90+x+(x-20)-(180)=0
We add all the numbers together, and all the variables
x+(x-20)-90=0
We get rid of parentheses
x+x-20-90=0
We add all the numbers together, and all the variables
2x-110=0
We move all terms containing x to the left, all other terms to the right
2x=110
x=110/2
x=55
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